Clamp



CCCC P.

' APPLICATION F MAY 4p '$92k lQy. Patented July 25, 1922.

HERMAN RIGERT, OF BROOKLYN, NEW YORK.

CLAMP.

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T 0 all w 7mm t'tmay/ concern Be it known that I, HERMAN Riennr, acitizen of the Republic of Switzerland, and a resident of the city ofNew York, borough of Brooklyn, in the county of Kings andState of NewYork, have invented a new and lmproved Clamp, of which the following isa full, clear, and exact description.

This invention relates to improvements in work holding clamps, theprimary object of the invention being to provide a clamp in which a pairof movable jaws are slidable upon an ordinary bolt.

A further object is to provide improved means for bracing the jawsagainst strains incidental tothe clamping of work between them and toprovide meansV for preventing bending of the rod or bolt when work isclamped between they jaws.

Another object is to provide improved means for locking one' ofthe awsagainst sliding movement on the bolt.

Still anotherl object isito provide a clamp which will be simple andpractical in construction, strong, durable and eilicient in use, andexceedingly inexpensive to manufacture.

lWith these and other objects in view, the

invention consists in certain novel features of construction andcombinations and arrangements of parts as will be more fully hereinafterdescribed and pointed out in the claims.

In the accompanying drawings Figure 1 is a view in side elevationillustrating myimproved clamp in use;

Figure 2 is an enlarged view in longitudinal section through one of thejaws;

Figure 3 is a fragmentary view in transverse section on the line 3 3;and

Figure 4 is a fragmentary sectional view through one of the jawsillustrating a modified form of locking means.

Referring in detail to the drawings, 1 represents a conventional type ofbolt, provided at one end with a head 2, and screw threaded adjacent itsother end, as indicated by lthe reference numeral S. l do not wish to belimited to the use of a bolt, but have found the bolt practical inconstructing clamps, which can be sold at a low price.

4 and 5 represent a pair of jaws boredtas indicated at 6, to receive thebolt 1 and slidable freely thereon.

The reference numerals 7, 7 are used to indicate a pair ofsemi-cylindrical bosses.

Specification of Letters Patent. PgL'l-.Qntedi'hy 211%. jpg22Application ined May 4, 1921.

Serial No. 466,714.

These bosses are integral with the aws 4and 5 and entend towardeachother. The bosses are located upon the opposite side of the bolt 1from `the gripping faces of the jaws. The gripping faces of the jaws areribbed or toothed, as indicated at 8, and are provided adjacent the rodor bolt 1 with transverse shoulders 9. The particular shape of thegripping'faces ofthe jaws is ofcourse irnmaterial since wish toconstruct jaws of different shapes for' special kinds of work. TWhen arectangular piece of workv such as 10 is clamped b'etweenthe' jaws, `theshoulders 9 prevent the turning movement of the work independent of theaws 4 and 5 and the work will act as a coupling to prevent turningmovement of the jaws independent of each other. j

rlhe jaw 5 is slidably freely upon the bolt 1 andis adjusted by means ofa wing nut or other suitable adjusting member around the threaded end 3ofthe bolt. The jaw 4'` is formed with a recess' 12 communieating withthe bore Gland in this recess a cam member' 13 is mounted. This cammember 18"include's a roundedextension 15 fitting within a roundeddepression 14 in the recess 12. The cam member 13 rocks on the extension15 and includes a toothed surface 16 engageable with the bolt 1 topositively lock thejaw 14 against sliding` movement on the bolt. A pin17 is passed through a relatively wide opening in the cam member 13. Thecam member does not pivot on the pin, but the pin prevents the cammember from falling out of the recess 12 when the jaw 4 is removed fromthe bolt. A weighted arm 18 serves as a finger hold for rocking the cam.In order to disengage the cam from the bolt 1, it is merely necessary toturn the bolt until the jaw 4 is in a diametrically opposite position tothe position illustrated in Figures land 2. The weight of the arm 18will then cause the cam to fall by gravity away from the bolt so thatthe jaw 4 may be slid freely on the bolt.

In Figure 4, I have illustrated a slight modification, wherein a aw 18is provided with a recess 19 communicating with a bore 20. A cam lockingmember 21 may be readily introduced into the recess before the jaw isslipped over the bolt 22, but after the jaw is mounted on the bolt, thecam cannot be removed. The cam operates on the same principle as the oneillustrated in the preferred form of the device to lock the jaw 18against movement, but instead of being provided with a roundedextension, the cam is formed with a curved recess 23 which rotates on acurved shoulder 24 within the recess 19. This cam member also includes aweighted extension 25 serving the same purpose as the extension 18 onthe cam member 13.

The manner of use of the clamp will be readily understood. VVorlr isintroduced between the jaws. The jaw 4L is locked at the desiredposition and the jaw 5 is adjusted by turning the adjusting nut 11 untilthe work is firmly clamped in place. If the work which is supportedbetween the jaws is of wood, the teeth 8 will dig into the work, as willbe readily understood.

As the jaws are advanced toward each other with a piece of work clampedbetween them, the natural tendency will be for the bolt l to bend at apoint between the two jaws. The bosses 7 effectively brace the boltagainst suoli transversestrains and prevent bending` thereof. By thuspreventing bending of the bolt, all undesirable friction between the nutll and the bolt is done away with. The nut is in direct alignment withthe jaw 5 and bears directly upon the end surface of the jaw. Bending ofthey bolt would not only cause friction between the threads and the nut,but also between the nut l1 and jaw 5.

Although I have illustrated one of the preferred embodiments of myinvention, it will be apparent that various slight changes and 35alterations might be made in the general A.l O

stantially semi-cylindrical bearing bosses Y integral with the jaws andpresented towards each other, said bosses and jaws being located onopposite sides of the rod, whereby to brace the aws against strain.

2. As a new article of manufacture, a clamp including a rod, a pair ofclamping jaws slidable and rotatable on the rod, substantiallysemi-cylindrical bearing bosses integral with the jaws and presentedtowards each other, said bosses and jaws being located on opposite sidesof the rod, whereby to brace the jaws against strain, one of said jawshaving a recess in that portion of the jaw which contacts with the rod,curved walls defining said recess, a cross pin fixed within the recess,a cam loosely pivoted on the pin, said cam including at its free end atoothed surface engageable with the rod, and formed adjacent its pivotedend with a rounded shoulder rocking on the extended bearing surfaceprovided by the curved walls of the recess.

HERMAN RIGERT.

